JPS5852787B2 - Toyshi Gourmano Truing Dressing Souch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for truing and dressing a grinding wheel using a hard material such as cubic boron nitride as abrasive grains.
It is an object of the present invention to provide a highly efficient true inking and dressing device.

Conventionally, when truing and dressing a grinding wheel with a cubic boron nitride abrasive grain layer fixed to the outer periphery of a base ring, a bar-shaped truing tool with embedded diamond abrasive grains is first fixed on a table, for example, and the grinding wheel is traversed. The outer periphery of the grinding wheel was being trued.

However, the peripheral speed of the grinding wheel during normal grinding work (45 m/
It has been experimentally found that if the above-mentioned truing is performed at a truing speed (approximately 300 mm), vibrations occur in the truing tool, making highly accurate truing impossible.

Therefore, in the past, it was necessary to reduce the circumferential speed of the grinding wheel to about 25,771/see for truing, which not only made the truing work complicated, but also complicated the rotational drive device of the grinding wheel. .

Furthermore, after truing, a worker presses a bar-shaped dressing tool containing alumina abrasive grains onto the outer periphery of the grinding wheel to dress the grinding wheel, but there is a problem in that safety and work efficiency are extremely poor.

The present invention was made in order to eliminate such conventional problems, and a rotary tool in which diamond abrasive grains and bird metal grains are sintered with a copper alloy on the outer peripheral surface of a disc-shaped base body is mounted relative to a grinding wheel. The gist is that the rotating tool rotates to reduce the circumferential speed, and after the rotating tool trues the grinding wheel, free abrasive grains are supplied between the rotating tool and the grinding wheel to dress the grinding wheel. be.

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a grinding wheel in which abrasive grains of a hard material such as cubic boron nitride are adhered to the outer peripheral surface of an aluminum disk in a layered manner, and is rotated at high speed clockwise in FIG.

Reference numeral 2 denotes a rotary tool, in which diamond abrasive grains 4 and grains 5 of hard metal such as tungsten, tungsten carbide, steel, etc. are coated with a copper alloy 6 on the outer peripheral surface of a disc-shaped base 3 made of an aluminum alloy. It has a sintered structure.

As an example, this sintered body has a composition in which 12.5% of diamond abrasive grains having a grain size of No. 70 and 3% of hard metal grains having a diameter of about 3 microns are sintered with the remaining weight percent of a copper alloy.

A tool support 7 rotatably supports the rotary tool 2 facing the grinding wheel 1, and the tool support 7 is mounted on a traverse table 8 so as to be movable forward and backward relative to the grinding wheel 1.

Reference numeral 9 denotes a motor fixed on the tool support 7, which drives the rotary tool 2.
is rotated counterclockwise by this motor 9 via a pulley and a belt, so that the relative circumferential speed with respect to the grinding wheel 1 is reduced.

A feed screw shaft 10 is screwed into the tool support 1 and rotatably supported on the traverse table 8.

A pinion 11 is freely rotatably supported on the feed screw shaft 10, and a pawl 13 pivotally supported on a rotating plate 12 fixed to the pinion 11 engages and disengages from a water wheel 14 keyed to the feed screw shaft 10. They are freely screwed together.

Therefore, when the pinion 11 is rotated by the operation of the rack piston 15, the feed screw shaft 10 is rotated through the pawl 13 and the water wheel 14.
is rotated forward, and the tool support I is moved forward by a predetermined amount.

The pinion 11, pawl 13, water wheel 14, rack piston 15, etc. constitute a feeding device 16 that feeds the rotary tool 2.

Further, a pinion 17 is freely rotatably supported on the feed screw shaft 10, and a rotating plate 18 is fixed to the pinion 17.
A pawl 19 pivotally supported on the feed screw shaft 10 is removably screwed into a water wheel 20 which is keyed to the feed screw shaft 10.

Therefore, when the pinion 17 is rotated by the operation of the rack piston 21, the feed screw shaft 1'0 is reversely rotated via the pawl 19 and the water wheel 20, and the tool support 7 is moved backward by an appropriate amount.

The pinion 1T, pawl 19, water wheel 20, rack piston 21, etc. constitute a gap providing device 22 that forms a gap of an appropriate size between the rotary tool 2 and the grinding wheel 1.

The amount of advance given to the tool support 7 by the feeding device 16 is greater than the amount of retreat given by the gap providing device 22 by the amount of feed for truing the rotary tool 2 to the grinding wheel 1.

The traverse table 8 is placed on a base 23 so as to be slidable in a direction parallel to the axis of the grinding wheel 1, and is reciprocated by a cylinder device 24.

25 is a nozzle that supplies dressing liquid to the gap,
Tank 2 in which dressing liquid is stored via pump P
6.

The dressing liquid was -flI, and 27 free abrasive grains (about 100μ in diameter) of alumina, silicon carbide, etc. were added to 10J of the grinding liquid.
) are mixed in 5001.

A stirring blade 28 is rotated by a motor 29 to prevent separation of the grinding fluid and free abrasive grains.

Next, the operation of the above embodiment will be explained based on the electric circuit shown in FIG.

When the truing/dressing command is sent, the motor 9 is activated to rotate the rotary tool 2, the contact 30 is closed, the relay CRI is energized, the feeding device 16 is activated, and the tool support 7 is rotated. is moved forward by a predetermined amount, and the rotary tool 2 is given feed for truing against the grinding wheel 1.

The traverse table 8 is reciprocated by the cylinder device 24 based on the operation completion signal of the feeding device 16, and the grinding wheel 1 is trued by the rotary tool 2.

When the traverse table 8 reciprocates and returns to its original position, a truing completion signal is sent, contacts 31b are opened, relay CRI is deenergized, and contacts 31a are closed and relay CR2 is energized.

The biasing of this relay CR2 activates the gap providing device 22 to move the tool support 7 backward, thereby creating a gap between the rotary tool 2 and the grinding wheel 1 with an appropriate size smaller than the outer diameter of the free abrasive grains 27. is formed, and at the same time, the pump P is started and the dressing liquid is spouted from the nozzle 25.

The traverse table 8 is reciprocated by the cylinder device 24 based on the operation completion signal of the gap providing device 22, and during this time, the free abrasive grains 27 supplied to the gap are bank-amplified by the hard metal grains 5 of the rotary tool 2. Grinding wheel 1
The abrasive grains are sprayed onto the bond (metal or synthetic resin) that holds them, scraping them off, making the abrasive grains protrude from the bond, and dressing the grinding wheel 1.

When the traverse table 8 reciprocates and returns to its original position, a dressing completion signal is sent, the contact 32b is opened, the relay CR2 is deenergized, and the truing and dressing of the grinding wheel 1 is completed.

Further, in order to perform dressing with free abrasive grains as in the above embodiment, it is necessary to move the rotary tool 2 backward relative to the grinding wheel 1 so that a gap is formed between the rotary tool 2 and the grinding wheel 1. Instead, the relative position of the rotary tool 2 with respect to the grinding wheel 1 may be set so that the amount of retreat is zero and the gap is zero.

As detailed above, according to the present invention, the rotary tool is rotated so as to reduce the relative circumferential speed with the grinding wheel, and the rotating tool is given a cut toward the grinding wheel to true the grinding wheel. Next, free abrasive grains are supplied between the rotary tool and the grinding wheel to dress the grinding wheel, so high-precision true ink can be produced without vibration during truing, and free abrasive grains can be Since grains are automatically fed, there is no need to rely on manual dressing, greatly improving safety and work efficiency.

Furthermore, since the present invention uses a rotating tool in which diamond abrasive grains and hard metal grains are sintered with copper alloy on the outer peripheral surface of the disc-shaped base, true ink and dressing can be performed in close proximity. Moreover, only one device is required for moving the rotary tool forward relative to the grinding wheel, resulting in a simple configuration.

[Brief explanation of drawings]

Fig. 1 is a side view of the truing/dressing device for a grinding wheel according to the present invention, Fig. 2 is a view taken from the ■ direction of Fig. 1, Fig. 3 is an explanatory diagram showing the dressing state, and Fig. 4 is for control. It is an electrical circuit diagram. 1... Grinding wheel, 2... Rotary tool, 3.
... Disc-shaped substrate, 4 ... Diamond abrasive grains, 5 ... Hard metal grains, 6°°°°°
°Copper alloy, 7... Tool support, 9...
Motor (rotary drive device), 16... Feeding device, 22... Gap providing device, 25... Tuzzle, 27... Free abrasive grains, P... ...Pump (dressing liquid supply device).

Claims (1)

[Claims] 1 A truing/dressing device is used with a grinding wheel containing hard material such as cubic boron nitride as abrasive grains rotating at high speed, and diamond abrasive grains and bird metal grains are applied to the outer peripheral surface of a disc-shaped substrate. a rotary tool sintered from a copper alloy; a tool support that rotatably supports the rotary tool opposite the grinding wheel and is movable relative to the grinding wheel; a rotational drive device that rotates to reduce the relative circumferential speed between the tool and the grinding wheel;
a feeding device that moves the tool support relatively forward toward the grinding wheel in order to apply feed to the rotating tool to true the grinding wheel; and the rotating tool and the grinding wheel to dress the trued grinding wheel. A true ink dressing device for a grinding wheel, comprising a supply device for supplying free abrasive grains between the grinding wheel and the wheel.